In the early onset of symptoms, irregular chlorotic macular spots appear on the leaf surface, which gradually expands into polygonal or irregular yellow-brown lesions. The diameter is 3 to 7 mm. When the humidity is high, the white backs or leaves grow on both sides. Consecutive patches caused dry leaves. Stem infected, dark brown irregular spots. The roots became ill, and the diseased parts had a slightly yellowish-to-grayish-stained scar. When stored, they could easily cause rot. The strains were infected and many species were endangered. The diseased part was light brown and irregular spots with white mold.
Control methods used disease-resistant varieties; appropriate sowing, not early sowing; and non-cruciferous crops every other year round; the former pay attention to clear diseased leaves and diseased plants. Seeds were sown with 0.4% 75% chlorothalonil wettable powder or 50% thiram wettable powder or 25% metalaxyl wettable powder. At the early stage of disease, timely removal of diseased leaves or diseased plants can be achieved with 75% chlorothalonil wettable powder 600 times; 50% sterilized Dan wettable powder 500 times; 25% metalaxyl wettable powder 800 times; 50% Pythium WP 1500 times, every 7 to 10 days to prevent 1 time, continuous control 3 to 4 times. The back of the leaf should also be sprayed with liquid medicine.
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